Sonochemical synthesis of hierarchically assembled tungsten oxides with excellent NO2-sensing properties

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Title:	Sonochemical synthesis of hierarchically assembled tungsten oxides with excellent NO2-sensing properties
Authors:	劉炯權;Bai, Shouli;Zhang, Kewei;Luo, Ruixian;Li, Dianqing;Chen, Aifan;Liu, Chung-Chiun
Contributors:	工學院材料科學與工程研究所
Keywords:	annealing;microstructure;nitrogen dioxide;oxalic acid;Porous materials;Semiconductors;Sensors;tungsten;Tungsten oxide;water
Date:	2013-09-11
Issue Date:	2026-04-23 11:44:57 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： Hierarchically assembled WO3·H2O spheres have been synthesized successfully by a facile sonochemical approach using oxalic acid as capping agent. The resultant WO3·H2O spheres with diameter of 1–3μm are actually assembled by many interlaced nanosheets with thickness of 10–20nm. The as-obtained orthorhombic WO3·H2O transforms into monoclinic WO3 without obvious change in morphology through annealing and dehydration. Furthermore, such 3D hierarchical spheres exhibit a strong structure-induced improvement in gas-sensing properties to ppm-level NO2, since the specific surface of sensing material and the gas diffusion are significantly enhanced due to its porous nano/microstructure. This work presents new insight towards the design of novel gas-sensing materials and improvement of sensor performance. •Hierarchically assembled WO3·H2O are synthesized by a facile sonochemical approach.•After annealing, orthorhombic WO3·H2O transforms into monoclinic WO3.•Such WO3 architecture exhibits structure-induced enhancement of NO2 response.•Gas diffusion and mass transfer in the WO3 architecture are significantly enhanced. 出版者： Elsevier B.V 出版日期： 2013-11-15 出處： Materials letters, 2013-11, Vol.111, p.32-34 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Elsevier B.V. 識別號： ISSN: 0167-577X 識別號： EISSN: 1873-4979 識別號： DOI: 10.1016/j.matlet.2013.08.041
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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